Bag-tying apparatuses



Sept. 19, 1961 G. NASLUND 3,000,158

BAG-TYING APPARATUSES Filed May 27, 1960 INVENTOR BY ifi zuQlmcx-sAIlORNEY United States Patent 3,000,158 BAG-TYING APPARATUSES GustavNiislund, Fack 29, Korstrask, Sweden Filed May 27, 1960, Ser. No. 32,256Claims priority, application Sweden May 29, 1959 3 Claims. (Cl. 53-198)This invention relates to a bag-typing apparatus of the type wrapping alength of pressure-sensitive tape about the gathered or twisted top ofbags of plastics or like materials for sealing said bags.

An object of the present invention is to provide an improved bag-tyingapparatus of the kind referred to, which is easy to handle, reliable inoperation, and permits quick and convenient tying of the bags withpressure-sensitive tape.

Another object of the invention is to provide an apparatus for tyingbags with pressure-sensitive tape which comprises a casing, a reel for apressure-sensitive tape supply roll, a guide wheel for said tape,registering U- shaped slots in facing side walls of said casingincluding an entry portion for thrusting the gathered or twisted bag toptherethrough to engage it with a length of tape, an intermediate portionfor wrapping the length of tape about the gathered or twisted bag top,and a blind portion for finishing wrapping of the tape length about thebag top and severing the tape, slide means assisting in moving thegathered or twisted bag top through the intermediate portion of saidregistering U-shaped slots, and knife means so arranged as to sever thetape when the tied bag top is moved through the end of the blind portionof said U-shaped slots, the free tape end clinging to the side of theknife means facing the tacky side of the tape. The essentialcharacteristics of the invention are that the slide means which has anotch for accommodating the gathered or twisted top of the bag isarranged to be moved in a rectilinear path along rod or like guide meansin the apparatus casing, and that the knife means is fixedly mounted inthe apparatus casing in a position parallel with the path of movement ofsaid slide means and spaced a small distance from the side of the saidslide means having said notch and facing the knife means.

Further objects of the invention and the advantages gained thereby willbecome apparent from the following description, reference being made tothe accompanying drawing which illustrates an embodiment of theapparatus, chosen by way of example. In the drawing:

FIG. 1 is a side elevational view of the apparatus partly in section online I-I in FIG. 2,

FIG. 2 is a section of the apparatus on line III in FIG. 1, showing agathered or twisted top of a bag thrust into the apparatus for tying.

Rotatably mounted in the casing 1 of the bag-tying apparatus is a reel 2for a pressure-sensitive tape supply roll. In facing side walls of thecasing are provided registering substantially U-shaped slots 3 fordrawing the gathered or twisted bag top therethrough to wrap a length oftape 7 about it. These registering substantially U- shaped slots includean entry portion 4 for thrusting the gathered or twisted bag toptherethrough to engage it with a length of tape, an intermediate portion5 for wrapping the length of tape about the gathered or twisted bag top,and a blind portion 6 for finishing wrapping of the tape length aboutthe bag top and severing the tape. The casing 1 also contains a slide 8which has a notch 9 adapted to take up the gathered or twisted bag topand is shiftable along the intermediate portion 5 of said U- slots, anda knife 10 which is fixedly mounted in the casing 1 in a positionparallel with the path of movement of the slide 8 and spaced a smalldistance from the side of said slide having said notch and facing thePatented Sept. 19, 1961- "ice knife. The knife 10 is so disposedrelative to the tape 7 taken from the supply roll that said tape-whenthe tape length used for tying a bag top is severed-will cling to theentire length of the knife 10 facing the tacky side of the tape 7.

According to the invention the slide 8 having the notch 9 is adapted tobe shifted in a rectilinear path along a rod or like guide 11 mounted inthe apparatus casing 1 in a position parallel with the intermediateportion 5 of the U-slots 3. The slide 8 is also guided by the innersides of the apparatus casing 1 primarily through a projection 14 on theslide.

The apparatus has a guide wheel 12 or like means for the tape 7. In theembodiment illustrated the turning or deviation point of said guidewheel 12 lies slightly beyond the plane in which the knife 10 ismounted. This arrangement will ensure that when the length of tape usedfor tying the bag is severed the free end of the tape will be pressedagainst the side of the knife 10 and cling thereto.

The slide 8 is under the load of a spring 13, which is interposedbetween a point of the apparatus casing 1 and the projection 14 on theslide 8, and is shiftable in the bag-tying direction against the actionof said spring 13. After each bag-tying operation the spring 13 willtherefore return the slide 8 to its initial position, a shock absorber15, preferably a washer of rubber or like material, damping this returnmovement of the slide 8.

The operation of the bag-tying apparatus will now be described more indetail. The gathered or twisted top of the bag is thrust through theentry portion 4 of the registering U-shaped slots 3 in the apparatuscasing 1 to engage the tape 7 and to enter the notch 9 in the slide 8,the tape 7 thus being partly wrapped about the bag top. While stilllying in said notch 9 the bag top is drawn through the intermediateportion 5 of the registering U-slots 3 and at the entrance to the blindportion 6 of the U-slots the bag top is moved out of said notch 9 in theslide 8 which will therefore be returned to its initial position by thespring 13. As the bag top is drawn upwards through said blind portion 6of the U-slots the wrapping of the tape 7 about it is completed, andwhen the bag top reaches the upper end of said portion 6 the tape willbe severed by the knife 10, and the free tape end pressed against theside of the knife, whereupon the tied bag is withdrawn laterally fromthe bag-tying apparatus.

The above embodiment of the invention was described for purpose ofillustration rather than limitation. All possible variations andmodifications of the invention are understood as being included withinthe spirit and scope of the appendant claims.

What I claim and desire to secure by Letters Patent is:

1. An apparatus for tying bags with pressure-sensitive tape whichcomprises a casing, a reel for a pressure-sensitive tape supply roll, aguide wheel for said tape, registering U-shaped slots in facing sidewalls of said casing including an entry portion for thrusting thegathered or twisted bag top therethrough to engage it with a length oftape, an intermediate portion for wrapping the length of tape about thegathered or twisted bag top, and a blind portion for finishing wrappingof the tape length about the bag top and severing the tape, slide meansassisting in moving the gathered or twisted bag top through theintermediate portion of said registering U-shaped slots, and knife meansso arranged as to sever the tape when the tied bag top is moved throughthe end of the blind portion of said U-shaped slots, the free tape endclinging to the side of the knife means facing the tacky side of thetape, characterized by the fact that the slide means which has a notchfor accommodating the gathered or r 3 twisted top of the bag is arrangedto be moved in a rectilinear path along rod or like guide means in theapparatus casing, and that the knife means is fixedly mounted in theapparatus casing in a position parallel with the path of movement ofsaid slide means and spaced a small distance from the side of the saidslide means having said notch and facing the knife means.

2. An apparatus as claimed in claim 1, characterized by the fact that ithas a guide wheel or like means for the tape, the turning or deviationpoint of said guide wheel lying slightly beyond the plane in which theknife is mounted.

3. An apparatus as claimed in claim 1, characterized by the fact thatthe slide means is under the load of a spring, which is interposedbetween a point of the apparatus casing and a projection on the slidemeans, and is shiftable in the bag-tying direction against the action ofsaid spring, a shock absorber being arranged to dampen the returnmovement of said slide means to the initial position thereof. 7

References Cited in the file of this patent UNITED STATES PATENTS

